Nokia says it sold 8.2 million Lumia phones last quarter. Lumia phones are the devices that run Microsoft's Windows Phone 8 operating system. Lumia sales had actually been growing quarter over quarter in 2013, but saw a decline in the final quarter. It sold 8.8 million Lumias in Q3 2013.

That's a troubling stat since sales declined during the holiday season. It's also a bad sign for the Windows Phone platform in general. Nokia is pretty much the only manufacturer that sells Windows Phones these days. HTC, Samsung, and others don't take the platform very seriously and concentrate on Android instead.

Nokia says its phones did not sell as well as expected because of increased competition from other manufacturers. It blamed the fact that other companies are selling smartphones cheaply for the lack of interest in Nokia handsets. Smartphone sales are declining year over year. (However, Nokia makes a few cheap Windows Phone models too.)